George john jabez manvell



(No Model.)

G. J. J. MANVELL. GAGE GLASS PROTECTOR FOR BOILERS.

N0. 59%,511. Patented Feb. 22,1898.

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GEORGE JOHN JABEZ MANVELL, OF LITTLEHAMPTON, ENGLAND.

GAGlE -GLASS PROTECTOR FOR BOILERS.

SPECIFICATION forming part of Letters IEatent No. 599,511, dated February 22, 1898.

Application fil d May 3, 1897. Serial No. 634,986. [No model.)

To ctZZ whom it may concern:

Be it known that I, GEORGE JOHN J ABEZ MANVELL, a subject of the Queen of Great Britain, residing at Littlehampton, in the county of Sussex, England, have invented anew or Improved Gage-Glass Protector for Boilers and such Like, of which the following is a specification.

This invention relates to a gage-glass protector for boilers and such likethat is to say, a removable cover to form a chamber to contain the gage-glass, so as to protect the latter from injury from external sources and also to prevent injury to the engineer or others and to prevent direct escape of steam or water into the stoke-hole or equivalent place in the event of the gage-glass bursting.

According to this invention the protector is suitably fitted or packed to form a closed chamber about the gage-glass, and an outlet is provided and fitted with an escape-pipe or connected to any existing escape or drain pipe to carry off any steam or water that may enter the chamber, so that the latter may not interfere with the movements of the engineer or other person in closing the cooks of the gage-glass.

The annexed drawings illustrate a gageglass protector constructed to fulfil the above objects.

Figure l is a front elevation of a gage-glass with its ordinary fittings and showing the protector fitted thereon. Fi 2 is a side elevation, and Fig. 3 is a horizontal section, illustrating the same parts.

A represents the gage-glass. B and O are the sockets holding the said gage-glass, and D E are the cooks thereof. Such sockets have usually cylindrical or similar parts I) 0, about which the protector may be fitted to form a close joint, usually with insertion of a packing-ring, as at b c.

F is the protector, which surrounds and incloses the gage-glass A. It is preferably made in two parts F F, having flanges ff, to be connected together by bolts f and thumbnuts f or in any other convenient manner, so that it may be removable without difficulty for the replacement of a broken gage-glass.

f represents a packing-strip between the flanges ff.

In place of two flanges the parts F F may have a hinge or other connection along one side and be connected by bolts or the like on the other.

The front part of the protector is provided with an opening, in which glass of sufficient strength is inserted, as at G. This may be retained in place-for instance, between an exterior plate G and an interior plate G The latter may be reinforced at G In the construction illustrated the outlet of the protector is provided in the middle of the back part, as at H 5 but it may be at any other place. For instance, it may be a passage through the metal of one of the sockets B C. It maybe covered with a wire-gauze or with a grating to prevent it being closed by a portion of the broken gage-glass lying thereover.

I do not confine myself to the construction here shown, but may vary the same within the spirit of this invention and in order that the operation of the invention may remain substantially the same.

Should the gage-glass break, the chamber F will be filled with steam or water, or both, which will escape by the vent H and be carried off by the pipe leading therefrom. On observing the occurrence the engineer will close the cooks D E, so that no further water or steam can enter the chamber F. The pressure in the latter having rapidly become equal to the exterior atmospheric pressure, the vent H being open, the protector may now be open ed and wholly or partially removed in order to replace the broken gage-glass with a new one. The protector may then be replaced and the cooks D E opened.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim isl A gage-glass protector consisting of two parts adapted to form a closed chamber sur rounding said glass, said parts having packed portions to engage the gage glass sockets, one of said parts having a transparent portion, means for securing said parts together and a discharge-outlet for said chamber in one of said parts, substantially as described.

GEORGE JOHN JABEZ MANVELL.

Witnesses:

G. F. REDFERN, JOHN E. BOUSFIELD. 

